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Finding the Fourth Proportional to 430.24, 643.93 and 391.81

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Solution

The fourth proportional to 430.24, 643.93 and 391.81 is: 586.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    430.24 : 643.93 = 391.81 : x
  2. Step 2: Convert to fraction form
    430.24/643.93 = 391.81/x
  3. Step 3: Cross multiply
    430.24x = 643.93 × 391.81
  4. Step 4: Simplify right side
    430.24x = 252,295.62
  5. Step 5: Solve for x
    x = 252,295.62/430.24
  6. Step 6: Final answer
    x = 586.41

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.